Select a size for your vehicle from the drop down and click the "Alternate Sizes" button to see a list of similar tire sizes.
You can then change the wheel size to see alternate sizes on a different diameter wheel.
Select a Size to Compare Prices on Available Tires
Ford equips the 2008 Mustang Shelby GT500 Convertible with a 255/45R18 front tire and a 285/40R18 rear tire. Click on the sizes for each tire to compare prices online.